Home / 1,113.04-1,670.16-420.18

Finding the Fourth Proportional to 1,113.04, 1,670.16 and 420.18

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Solution

The fourth proportional to 1,113.04, 1,670.16 and 420.18 is: 630.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.04 : 1,670.16 = 420.18 : x
  2. Step 2: Convert to fraction form
    1,113.04/1,670.16 = 420.18/x
  3. Step 3: Cross multiply
    1,113.04x = 1,670.16 × 420.18
  4. Step 4: Simplify right side
    1,113.04x = 701,767.83
  5. Step 5: Solve for x
    x = 701,767.83/1,113.04
  6. Step 6: Final answer
    x = 630.50

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.